CN111371596A - Data distribution service software based on FC-AE bus - Google Patents

Data distribution service software based on FC-AE bus Download PDF

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CN111371596A
CN111371596A CN202010115932.6A CN202010115932A CN111371596A CN 111371596 A CN111371596 A CN 111371596A CN 202010115932 A CN202010115932 A CN 202010115932A CN 111371596 A CN111371596 A CN 111371596A
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data
message
msgids
bus
receiving
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CN111371596B (en
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崔杰
张涛
孙帷胜
王冠
储燕
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China Aeronautical Radio Electronics Research Institute
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0803—Configuration setting
    • H04L41/0823—Configuration setting characterised by the purposes of a change of settings, e.g. optimising configuration for enhancing reliability
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/12—Discovery or management of network topologies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/02—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
    • H04L67/025—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP] for remote control or remote monitoring of applications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1097—Protocols in which an application is distributed across nodes in the network for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/14—Session management
    • H04L67/146—Markers for unambiguous identification of a particular session, e.g. session cookie or URL-encoding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/55—Push-based network services

Abstract

The invention discloses data distribution service software based on an FC-AE bus, which determines the position information of a communication node by configuring a message sending ID table, a message receiving ID table, a message sending ID table and a message receiving ID table; when a data theme is received, all MsgIDs in a message ID table are received through timed polling, and as long as data arrive at the MsgIDs, corresponding FC bus message data are received through an FC-AE driving program hooked in a callback global information configuration and initialization module, and the received data themes are reported layer by layer; and when the data subject is issued, calling an FC-AE drive function to send the data subject according to the MsgID in the ID table of the sent message. The invention greatly improves the expandability of the system and the flexibility of data communication based on the data transmission mode of the publish-subscribe. The requirements of effective data interconnection, intercommunication and interoperation among the distributed avionics system devices are met.

Description

Data distribution service software based on FC-AE bus
Technical Field
The invention belongs to the field of computer communication, and particularly relates to data distribution service software for data interconnection and intercommunication among heterogeneous devices based on a real-time deterministic data bus (FC-AE) in an aircraft avionics system.
Background
With the successful application of Integrated Modular Avionics (IMA) to aircraft such as a380, a400M and B787, the degree of Avionics system integration is continuously enhanced, and Distributed Integrated Modular Avionics (DIMA) has become the direction of Avionics system architecture development for the problem of fault diffusion and dynamic resource management between different functions using the same hardware resources existing in IMA at present. One of the most important features of DIMA is the communication of data between Core Processing Modules (CPMs) or externally using a real-time deterministic network. At present, the most used real-time deterministic data buses comprise FC-AE and AFDX, wherein the AFDX bus is widely used in civil aircrafts due to the mature technology. The FC-AE bus has the advantages of high bandwidth and flexible configuration, but the technical maturity is to be improved, so that the FC-AE bus is more used in military aircraft at present. Whether the FC-AE or AFDX bus adopts a real-time deterministic network protocol, namely before the actual operation, the static configuration of data flow needs to be carried out on nodes needing data communication in the network, and the transmitted application message and the bottom layer MsgID are mapped one by one. This, while improving the certainty of network communication, also reduces the flexibility of the application and the scalability of the system.
The DDS (Data Distribution Service) is a Data communication Service protocol published by an OMG organization, and adopts a Data-centered publishing and subscribing mechanism to change the original 'sending and receiving on time' into 'publishing and subscribing on demand', thereby enhancing the effectiveness of system Data transmission and reducing unnecessary bandwidth consumption. Meanwhile, the reliability and flexibility of system communication are greatly enhanced by providing rich Qos strategies. At present, a lot of mature DDS products in the market, especially RTI DDS, are widely used in ground communication devices and ships, but there is no successful case in an airborne embedded environment, which is mainly because the current DDS products can only support transmission mechanisms such as ethernet (TCP, UDP) and shared memory, but cannot support real-time deterministic network protocols such as FC-AE bus protocol. Because the deterministic and static configuration attributes of the FC-AE protocol have a large conflict with the dynamic discovery mechanism of the DDS, the application of DDS products in onboard DIMA is limited.
In summary, it can be seen that for the development of distributed integrated avionics, a highly reliable distributed real-time communication middleware capable of supporting an FC-AE bus protocol is urgently needed to meet the requirement of data communication between the inside and outside of the aircraft under the distributed integrated modular avionics architecture. The method adopts a data-centered publishing and subscribing mechanism, and enhances the expandability of the system and the flexibility of communication through a dynamic discovery mechanism of the application node. Meanwhile, the method shields the differences of hardware environment, operating system, programming language and the like among all components of the distributed system, and lays a solid foundation for realizing the plug and play of the software module in the distributed system.
Disclosure of Invention
The invention aims to provide data distribution service software based on an FC-AE bus, and provides a flexible data transmission mode which can transmit and receive data as required for a 'rigid' deterministic network which needs static configuration. The data transmission mode based on the publish-subscribe supports the dynamic discovery of the application nodes, and greatly improves the expandability of the system and the flexibility of data communication. The requirements of effective data interconnection, intercommunication and interoperation among the distributed avionics system devices are met.
A data distribution service software based on FC-AE bus comprises a global information configuration and initialization module, a subscription data receiving and processing module and a data publishing and processing module on any communication node on the FC-AE bus;
the global information configuration and initialization module comprises the hooking of an FC-AE driver and a transmission interface layer callback function, the configuration of a sent message ID table and a received message ID table, and the mapping of the sent message ID table and the received message ID table; the message sending ID table needs to be configured with N +1 MsgIDs for sending, wherein the N MsgIDs are unicast MsgIDs of each communication node, and the +1 MsgIDs are MsgIDs for multicasting; the receiving information ID table needs to be configured with N + N msgIDs for receiving, wherein N msgIDs are unicast msgIDs for receiving other communication nodes, and + N msgIDs are msgIDs for receiving multicast;
the subscription data receiving and processing module polls all MsgIDs in the message ID table at regular time, receives corresponding FC bus message data through an FC-AE driving program hooked in the callback global information configuration and initialization module as long as the MsgIDs have data, and reports the received data themes layer by layer;
the data issuing and processing module calls an FC-AE drive function to send a data theme according to the MsgID in the message sending ID table; the data theme comprises two types of themes, wherein one type is a discovery theme which is sent in a broadcast mode, and the discovery theme is used for dynamic discovery of communication parties; the other is a service data topic which is sent in a unicast mode, and the service data topic is service data published and subscribed by both communication parties.
Further, the system comprises a heartbeat detection module, which is used for periodically sending heartbeat packets to other nodes according to the MsgID in the message ID sending table and detecting the state of each communication node in the FC-AE network according to the mode of waiting for response by the MsgID in the message ID receiving table.
The invention provides high-reliability data distribution service software for a DIMA system which takes an FC-AE bus as a basic data network, the data distribution service software provides a data transmission mechanism based on publishing and subscribing, a fixed mode of 'on-time sending' of bus data of the traditional avionic system is changed into 'on-demand sending', and unnecessary network bandwidth consumption is reduced. In addition, the dynamic discovery mechanism provided by the method greatly improves the expandability of the system and the flexibility of data communication, and reduces the coupling degree of both communication parties.
Drawings
FIG. 1 is a message topology diagram for FC communication nodes;
FIG. 2 is a topology diagram of a FC communication node receiving a message;
FIG. 3 is a subscription data reception and processing module workflow diagram;
FIG. 4 is a publish business data topic workflow diagram;
FIG. 5 is a heartbeat detection module workflow diagram;
fig. 6 is a schematic structural diagram of data distribution service software based on the FC-AE bus protocol.
Detailed Description
For a better understanding of the invention, reference is made to the following detailed description of the invention, which is to be read in connection with the accompanying drawings and examples.
The data distribution service software based on the FC-AE bus protocol shown in this embodiment is used for enabling the traditional DDS software to support the FC-AE bus protocol, so that the DDS can be successfully applied to the design process of an airborne avionics system, and the expansibility of an avionics network topology and the flexibility and reliability of data transmission are improved.
Traditional DDS software can only support the ethernet (UDP/TCP) protocol. Because the implementation of the "dynamic discovery mechanism", one of the most important features of DDS, mainly depends on the IP address and UDP port in the ethernet protocol. The focus of the core of the dynamic discovery mechanism is the IP addresses of the self and the opposite node. The local node sends out the IP address of the local node through broadcasting the Topic, if the Topic is successfully matched, the IP address of the opposite party end is placed into a local sending routing table, communication connection between the two parties is established, and publishing and subscribing of the service data theme are started. However, the onboard real-time deterministic bus, such as FC-AE, has no concept of IP address for the user, only sending message MsgID and receiving message MsgID, which brings great difficulty to the implementation of the dynamic discovery mechanism. The solution provided by the invention is to statically construct the minimum-scale bottom layer physical network topology aiming at the protocol transmission characteristic of a real-time deterministic network (FC-AE), and the flexibility of data transmission is improved to the maximum extent through a mapping algorithm of a DDS data subject packet and a bottom layer MsgID. In other words, it is the data Topic that is passed between two correspondent nodes that shares the underlying MsgID as much as possible.
Referring to fig. 6, in the data distribution service software based on the FC-AE bus according to this embodiment, any one communication node on the FC-AE bus includes a global information configuration and initialization module, a subscription data receiving and processing module, a data publishing and processing module, and a heartbeat detection module.
Global information configuration and initialization module
The module mainly comprises the hooking of an FC-AE driver and a transmission interface layer callback function so as to improve the transplantable capability of the data distribution service software across hardware driving platforms. In addition, the module also comprises an initialization process of a sending message ID table and a receiving message ID table which need static configuration, the two tables need static configuration, but adopt a mode of minimizing configuration, and as long as the number of communication nodes in the FC-AE network is determined, the contents of the sending message ID table and the receiving message ID table of the communication nodes are determined and do not change along with the increase and decrease of the number of applications residing on the communication nodes.
Referring to fig. 1, a local communication node a and N communication nodes are shown as a MsgID message sending topology diagram for DDS data transmission through an FC-AE network. As can be seen from the figure, for a send tunnel, the send message ID table of communication node a needs to be configured with N +1 send msgids, where N msgids are unicast msgids associated with each communication node, and +1 is a multicast MsgID represented in black. Multicast MsgID is used only for dynamic discovery, and communication node a broadcasts its own message via this multicast MsgID, while unicast MsgID is used to send data topics, i.e. all DDS data topics (Topic) that communication node a sends to communication node 1 are the tunnel of shared Msg 1. With this network topology, as long as the number of communication nodes in the FC-AE network is determined, the number of its sent msgids for the local communication node is also determined (N + 1).
Referring to fig. 2, a local communication node a and N communication nodes perform a received MsgID message topology for DDS data transmission via an FC-AE network, where black lines indicate msgids for receiving broadcast and gray lines indicate msgids for receiving unicast. For the receiving tunnel, the receiving information ID table of the communication node a needs to be configured with N + N msgids for receiving, where N is a unicast MsgID for receiving other communication nodes, and + N is an MsgID for receiving multicast. The multicast message is only used for dynamic discovery, the communication node a receives the discovery topics of other nodes through N multicast links respectively, and the unicast message is used for receiving the data topics, that is, the communication node a receives all the data topics (Topic) of the communication node 1 through the message tunnel of Msg 1. With this network topology, as long as the number of physical nodes in the system is determined, the number of received msgids for a local communication node is also determined (2N).
By establishing the sending message ID table and the receiving message ID table and simultaneously establishing the mapping relation between the sending message ID table and the receiving message ID table, the position information of the communication node can be uniquely determined through the MsgID mapping information, and the difficulty caused by the absence of an IP address is avoided.
The network topology configuration strategy can reduce the constraint limit brought by a deterministic network to the maximum extent and keep the flexibility of the DDS as much as possible.
(II) subscription data receiving and processing module
See figure 3 for a workflow diagram of the subscription data receiving and processing module. The traditional DDS receiving and subscribing theme based on the Ethernet calculates the UPD port number needing to be monitored through a formula, and the calculation formula comprises elements such as a domain ID, a domain participant ID, a basic UDP port number and the like. For each calculated UDP port, the DDS assigns a thread to perform real-time monitoring on input data of the UPD port, when no data comes, the thread is in a suspension waiting state, and once data comes, the thread is immediately awakened to perform data receiving and reporting processing. Since the FC-based data distribution service software has no IP address and UDP port concept, there is only one received message ID table, which records all FCs that the node needs to receive: the processing mode of the invention is to construct a periodic thread, periodically poll and receive all MsgIDs in the message ID table, receive corresponding FC bus message data through an FC-AE driving program hooked in a callback global information configuration and initialization module as long as the MsgIDs have data, and report received data themes layer by layer. Because the DDS reports the message in a layered way, the bottom layer is an FC transmission interface layer used for receiving and sending FC bus data. The upper layer is an RTPS interface layer which is used for processing the integrity and the effectiveness of the received DDS data frame in real time and realizing a heartbeat mechanism. And the last layer is a DR (Data _ Reader _ Inf) interface layer which mainly carries out deserialization processing on DDS Data frames, converts the network format into a user-specified format, simultaneously processes a callback function of a user Data Reader, and reports the received service subject Data to the Data Reader for user state processing. Each layer of interface stores a bind table, which records the information of the upper layer of the interface subscribed to the data topic interface and is used for uploading data frames layer by layer.
(III) a data issuing and processing module,
referring to the work flow diagram of the data publishing and processing module shown in fig. 4, since the discovery subject is processed in the DDS protocol layer, the specific sending process is consistent with the sending process of the user service data, and this section mainly describes the sending process of the user service data. The whole Data distribution process adopts a layer-by-layer issuing method, a Data Writer issues a Data topic to a DW (Data _ Writer _ Inf) interface layer, and the layer mainly carries out serialization processing on Data frames and converts a user format into a network transmission format. And the DW layer issues the serialized data frames to an RTPS interface layer, and the RTPS interface layer sets the heartbeat packet and the time stamp according to the specified transmission quality of service (Qos) and forms a data theme. And the RTPS interface layer retrieves the interface information of a lower layer (FC transmission interface layer) and issues the data theme to the FC transmission layer, and the FC transmission layer calls an FC drive function to send the data theme according to the message ID in the MsgID sending table. Each layer of interface stores a route (route) table, which records the information of the data topic interface issued by the next layer of the interface and is used for issuing data frames layer by layer. And finally, sending corresponding FC bus message data by an FC-AE driver hooked in the callback global information configuration and initialization module.
The data topic comprises two types of topics, one is a discovery topic which is used for dynamic discovery of the two communication parties to each other, and the 'mutual discovery' is a precondition for the two communication parties to publish a subscription. The other is a service data topic, and the topic is the service data of true publishing and subscribing of the two communication parties. In the "send message ID" table, different topics are distinguished by different send flags, "find topics" are all sent in broadcast form, and "service data topics" are all sent in unicast form.
(IV) heartbeat detection module
The method aims to monitor the health condition of each node in the system in real time, and detects the state of each node in the system by periodically sending heartbeat packets to other nodes and waiting for responses.
Referring to the engineering flow chart of the heartbeat detection module shown in fig. 5, in the local communication node, the "initialization parameter" of the heartbeat packet sending thread refers to setting a sending period of the heartbeat packet, the heartbeat packet is sent periodically through a timer timeout mechanism, and when the timer times out, the heartbeat packet is broadcasted according to the sending message ID table. When the feedback information receiving thread receives feedback information of other communication nodes on the FC-AE network through the polling receiving message ID table, and when the feedback information requires the client to retransmit the heartbeat packet, the client retransmits the heartbeat packet. Otherwise, continuously waiting for receiving the feedback information.

Claims (2)

1. A data distribution service software based on FC-AE bus comprises a global information configuration and initialization module, a subscription data receiving and processing module and a data publishing and processing module on any communication node on the FC-AE bus, and is characterized in that:
the global information configuration and initialization module comprises the hooking of an FC-AE driver and a transmission interface layer callback function, the configuration of a sent message ID table and a received message ID table, and the mapping of the sent message ID table and the received message ID table; the message sending ID table needs to be configured with N +1 MsgIDs for sending, wherein the N MsgIDs are unicast MsgIDs of each communication node, and the +1 MsgIDs are MsgIDs for multicasting; the receiving information ID table needs to be configured with N + N msgIDs for receiving, wherein N msgIDs are unicast msgIDs for receiving other communication nodes, and + N msgIDs are msgIDs for receiving multicast;
the subscription data receiving and processing module polls all MsgIDs in the message ID table at regular time, receives corresponding FC bus message data through an FC-AE driving program hooked in the callback global information configuration and initialization module as long as the MsgIDs have data, and reports the received data themes layer by layer;
the data issuing and processing module calls an FC-AE drive function to send a data theme according to the MsgID in the message sending ID table; the data theme comprises two types of themes, wherein one type is a discovery theme which is sent in a broadcast mode, and the discovery theme is used for dynamic discovery of communication parties; the other is a service data topic which is sent in a unicast mode, and the service data topic is service data published and subscribed by both communication parties.
2. The FC-AE bus-based data distribution service software according to claim 1, further comprising a heartbeat detection module for periodically sending heartbeat packets to other nodes according to MsgID in the send message ID table and detecting the status of each communication node in the FC-AE network according to MsgID waiting for response in the receive message ID table.
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CN112217567A (en) * 2020-09-25 2021-01-12 中国直升机设计研究所 Multi-node simulation method for FC (fiber channel) bus
CN112217567B (en) * 2020-09-25 2023-06-06 中国直升机设计研究所 FC bus multi-node simulation method
CN112821952A (en) * 2020-12-07 2021-05-18 沈阳飞机设计研究所扬州协同创新研究院有限公司 Data subscription and distribution method based on FC network
CN112887009A (en) * 2021-01-22 2021-06-01 中国人民解放军国防科技大学 Satellite-borne multifunctional multi-system measurement and control communication interoperation terminal and communication method
CN112667387A (en) * 2021-03-15 2021-04-16 奥特酷智能科技(南京)有限公司 DDS-based design model for synchronization of persistent data objects
CN112667387B (en) * 2021-03-15 2021-06-18 奥特酷智能科技(南京)有限公司 DDS-based design model for synchronization of persistent data objects
CN113347080A (en) * 2021-06-30 2021-09-03 奥特酷智能科技(南京)有限公司 Local area network instant communication method based on data distribution service
CN113347080B (en) * 2021-06-30 2022-05-20 奥特酷智能科技(南京)有限公司 Local area network instant messaging method based on data distribution service
CN113890680A (en) * 2021-09-27 2022-01-04 电子科技大学 Transmission method applied to fiber channel avionics network DDS
CN114338268A (en) * 2021-12-23 2022-04-12 中国航空工业集团公司西安航空计算技术研究所 FC bus-based publish/subscribe communication method in avionics system

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